Fair Value Measurements (Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis) (Details) - Fair Value [Member] - USD ($)	Mar. 31, 2020	Sep. 30, 2019
Quoted Prices in Active Markets (Level 1) [Member]
Liabilities:
Total	$ 0	$ 0
Significant Other Observable Inputs (Level 2) [Member]
Liabilities:
Total	0	0
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Total	117,181,480	100,900,952
Recurring [Member]
Liabilities:
Natural gas purchases	316,120	397,757
Total	2,494,492	1,292,098
Recurring [Member] | Interest Rate Swap [Member]
Liabilities:
Interest rate swap	2,178,372	894,341
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]
Liabilities:
Natural gas purchases	0	0
Total	0	0
Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Interest Rate Swap [Member]
Liabilities:
Interest rate swap	0	0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities:
Natural gas purchases	316,120	397,757
Total	2,494,492	1,292,098
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Swap [Member]
Liabilities:
Interest rate swap	2,178,372	894,341
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Natural gas purchases	0	0
Total	0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Swap [Member]
Liabilities:
Interest rate swap	$ 0	$ 0